Commands

There are key commands for pip.

$ pip3 --help
Usage:
pip <command> [options]
Commands:
install Install packages.
download Download packages.
uninstall Uninstall packages.
freeze Output installed packages in requirements format.
list List installed packages.
show Show information about installed packages.
check Verify installed packages have compatible dependencies.
search Search PyPI for packages.
wheel Build wheels from your requirements.
hash Compute hashes of package archives.
completion A helper command used for command completion.
help Show help for commands.
General Options:
-h, --help Show help.
--isolated Run pip in an isolated mode, ignoring environment variables
and user configuration.
-v, --verbose Give more output. Option is additive, and can be used up to
3 times.
-V, --version Show version and exit.
-q, --quiet Give less output. Option is additive, and can be used up to
3 times (corresponding to WARNING, ERROR, and CRITICAL
logging levels).
--log <path> Path to a verbose appending log.
--proxy <proxy> Specify a proxy in the form [user:passwd@]proxy.server:port.
--retries <retries> Maximum number of retries each connection should attempt
(default 5 times).
--timeout <sec> Set the socket timeout (default 15 seconds).
--exists-action <action> Default action when a path already exists: (s)witch,
(i)gnore, (w)ipe, (b)ackup, (a)bort.
--trusted-host <hostname> Mark this host as trusted, even though it does not have
valid or any HTTPS.
--cert <path> Path to alternate CA bundle.
--client-cert <path> Path to SSL client certificate, a single file containing the
private key and the certificate in PEM format.
--cache-dir <dir> Store the cache data in <dir>.
--no-cache-dir Disable the cache.
--disable-pip-version-check
Don't periodically check PyPI to determine whether a new
version of pip is available for download. Implied with --no-
index.

Install

$ sudo pip3 install numpy

You may need to use absolute path for pip3. I am faced it on Linux environment.

$ sudo /usr/local/python-3.5.2/bin/pip3 install numpy

Unstall

$ sudo pip3 uninstall numpy

Download

This is similar with Rubygem's gem fetch gem_name

$ sudo pip3 download numpy

Freeze

$ pip3 freeze -h
Freeze Options:
-r, --requirement <file> Use the order in the given requirements file and its
comments when generating output. This option can be used
multiple times.
-f, --find-links <url> URL for finding packages, which will be added to the output.
-l, --local If in a virtualenv that has global access, do not output
globally-installed packages.
--user Only output packages installed in user-site.
--all Do not skip these packages in the output: pip, setuptools,
distribute, wheel